K4E660812D,K4E640812D
CMOS DRAM
8M x 8bit CMOS Dynamic RAM with Extended Data Out
DESCRIPTION
This is a family of 8,388,608 x 8 bit Extended Data Out Mode CMOS DRAMs. Extended Data Out Mode offers high speed random
access of memory cells within the same row. Refresh cycle(4K Ref. or 8K Ref.), access time (-45, -50 or -60), power consumption(Nor-
mal or Low power) are optional features of this family. All of this family have CAS-before-RAS refresh, RAS-only refresh and Hidden
refresh capabilities. Furthermore, Self-refresh operation is available in L-version. This 8Mx8 EDO Mode DRAM family is fabricated using
Samsung¢s advanced CMOS process to realize high band-width, low power consumption and high reliability.
FEATURES
• Extended Data Out Mode operation
• CAS-before-RAS refresh capability
• RAS-only and Hidden refresh capability
• Self-refresh capability (L-ver only)
• Fast parallel test mode capability
• LVTTL(3.3V) compatible inputs and outputs
• Early Write or output enable controlled write
• JEDEC Standard pinout
• Part Identification
- K4E660812D-JC/L(3.3V, 8K Ref.)
- K4E640812D-JC/L(3.3V, 4K Ref.)
- K4E660812D-TC/L(3.3V, 8K Ref.)
- K4E640812D-TC/L(3.3V, 4K Ref.)
• Active Power Dissipation
Unit : mW
Speed
-45
8K
4K
432
396
360
• Available in Plastic SOJ and TSOP(II) packages
• +3.3V±0.3V power supply
324
288
252
-50
-60
• Refresh Cycles
FUNCTIONAL BLOCK DIAGRAM
Part
NO.
Refresh
cycle
Refresh time
Normal
L-ver
RAS
CAS
W
Vcc
Vss
Control
Clocks
K4E660812D*
K4E640812D
8K
4K
64ms
128ms
VBB Generator
* Access mode & RAS only refresh mode
: 8K cycle/64ms(Normal), 8K cycle/128ms(L-ver.)
CAS-before-RAS & Hidden refresh mode
Row Decoder
Refresh Timer
Refresh Control
Data in
Buffer
: 4K cycle/64ms(Normal), 4K cycle/128ms(L-ver.)
Memory Array
8,388,608 x 8
Cells
DQ0
to
DQ7
Refresh Counter
Row Address Buffer
Col. Address Buffer
¡Ü Performance Range:
Data out
Buffer
A0~A12
(A0~A11)*1
Speed
-45
tRAC
45ns
50ns
60ns
tCAC
12ns
13ns
15ns
tRC
tHPC
17ns
20ns
25ns
OE
74ns
84ns
104ns
A0~A9
(A0~A10)*1
Column Decoder
-50
Note) *1 : 4K Refresh
-60
SAMSUNG ELECTRONICS CO., LTD. reserves the right to
change products and specifications without notice.